Protective structure for power output driven shaft of tractor

Abstract

A protection structure for a power output driven shaft of a tractor comprises a power output shell. A driven shaft bearing and a driven shaft bearing clamp spring for limiting the axial movement of the driven shaft bearing are arranged in the power output shell; the power output driven shaft is mounted on the inner sides of the driven shaft bearing clamp spring and the driven shaft bearing; and the power output shell is provided with a protective flange for providing support when the driven shaft bearing snap spring deforms. Axial impact force generated by the universal transmission shaft on the power output shaft during transition of the tractor or working with a machine tool is overcome, and faults such as breakage and damage of a bearing clamp spring, early abrasion of a power output shell and tooth breaking of a gear caused by axial movement of a driven shaft due to overlarge axial impact force are prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of wheeled tractors, in particular to a protective structure for a tractor power output driven shaft. Background Art

[0002] With the increasing application of agronomy and supporting agricultural machinery to the PTO power output mechanism of high-horsepower wheeled tractors, frequent failures occur in the PTO power output of high-horsepower wheeled tractors of 200 and above. Among them, the failure of the driven shaft caused by the broken retaining spring of the power output driven shaft is particularly prominent. Through investigation, it was found that when the tractor is transferred with the implements, the implements are lifted to a high place. During the driving process, due to the ups and downs of the road surface and complex working conditions, the implements form tensile stress and compressive stress on the power output driven shaft through the universal joint. The two loads alternate with each other and the impact force is large, which is the main reason for the damage to the bearings and retaining springs. Utility Model Content

[0003] The utility model aims to provide a protective structure for a tractor power output driven shaft, in which a protective flange for protecting a retaining spring is installed on a housing to prevent the bearing retaining spring from being broken and damaged, the power output housing from being worn early, the gear from being knocked, and other faults caused by the axial movement of the driven shaft due to excessive axial impact force.

[0004] The technical solution adopted by the utility model is: a protective structure for a tractor power output driven shaft, comprising a power output housing;

[0005] A driven shaft bearing and a driven shaft bearing retaining spring for limiting the axial movement of the driven shaft bearing are arranged in the power output housing, and the power output driven shaft is installed inside the driven shaft bearing retaining spring and the driven shaft bearing;

[0006] A protective flange is provided on the power output housing to provide support for the driven shaft bearing retaining ring when it is deformed.

[0007] As a preferred solution, the protective flange is annular, and a neck is axially extended at the inner ring.

[0008] As a preferred solution, after assembly, an isolation gap is provided between the neck and the driven shaft bearing retaining spring in the axial direction.

[0009] As a preferred solution, the width of the isolation gap is 0.15-0.25 mm.

[0010] As a preferred solution, a driven gear bushing is fixed to the outer end of the power output driven shaft, and a power output driven gear is fixed to the driven gear bushing;

[0011] A driven gear retaining ring for limiting the axial movement of the driven shaft bearing is arranged on the power output driven shaft, and the driven gear retaining ring is located in the installation gap between the driven gear bushing and the driven shaft bearing.

[0012] As a preferred solution, there is a width difference between the width of the installation gap and the axial width of the driven gear retaining ring.

[0013] As a preferred solution, the width difference is 0.1-0.5 mm.

[0014] As a preferred solution, the protective flange is fixedly connected to the power output housing via connecting bolts.

[0015] As a preferred solution, the inner wall of the power output housing is provided with an annular groove for installing a driven shaft bearing retaining ring.

[0016] The beneficial effects of the utility model are:

[0017] Based on the defects of the prior art, a protective structure for a tractor power output driven shaft is provided. Compared with the prior art:

[0018] 1. By verifying and simulating the working conditions of tractors equipped with agricultural machinery, the protection of the PTO power output driven shaft bearing retaining spring is strengthened by adding a protective flange structure to prevent the bearing retaining spring from being broken and damaged, the power output housing from being worn early, the gear from being knocked, and other faults caused by the axial movement of the driven shaft due to excessive axial impact force.

[0019] 2. This protective structure makes as few changes as possible to the connection dimensions, assembly process, etc. of the original power output assembly structure, while improving product reliability and ease of use.

[0020] 3. Set the isolation gap to ensure that when the tractor PTO power output is working normally, there is no force between the protective flange and the driven shaft bearing retaining spring, which does not affect the normal operation of the PTO power output driven shaft system.

[0021] 4. A driven gear retaining ring matched with the driven shaft bearing retaining ring is provided to assist in supporting and protecting the driven shaft bearing. At the same time, the driven gear retaining ring will not excessively restrict the driven shaft bearing, thereby ensuring the effectiveness of the protective flange protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 It is a schematic diagram of a partial section of the utility model.

[0024] Figure numerals: 1. power output driven gear, 2. connecting bolt, 3. protective flange, 4. driven shaft bearing retaining spring, 5. driven gear retaining ring, 6. power output housing, 7. power output driven shaft, 8. driven gear bushing, 9. driven shaft bearing. DETAILED DESCRIPTION

[0025] The present invention is described in detail below by way of exemplary embodiments. However, it should be understood that, without further description, elements, structures and features in one embodiment may also be beneficially combined in other embodiments.

[0026] It should be noted that: unless otherwise defined, the technical terms or scientific terms used in this article should be understood by people with ordinary skills in the field to which the utility model belongs. The words "one", "an" or "the" and the like used in the patent application specification and claims of this utility model do not express quantitative restrictions, but indicate the existence of at least one; the "first", "second" and "third" used in this article should not be regarded as restrictions on the order of components, but are only used to distinguish different components; "include" or "comprise" and other similar words indicate that the elements or objects appearing before "include" or "comprise" include the elements or objects listed after "include" or "comprise" and their equivalents, but do not exclude other elements or objects with the same function.

[0027] In order to more clearly describe the specific structural composition of the driven shaft protection structure, Figure 1 Describe this embodiment:

[0028] like Figure 1 As shown, a protective structure for a tractor power output driven shaft, a driven shaft bearing 9 and a driven shaft bearing retaining spring 4 for limiting the axial movement of the driven shaft bearing 9 are arranged in a power output housing 6, and a power output driven shaft 7 is installed inside the driven shaft bearing retaining spring 4 and the driven shaft bearing 9;

[0029] A protective flange 3 is provided on the power output housing 6 to provide support for the driven shaft bearing retaining spring 4 when it is deformed. After the driven shaft bearing retaining spring 4 is deformed to a certain extent, it is supported by the protective flange 3. When the tractor PTO power output driven shaft 7 is subjected to an external axial force, the protective flange 3 provides a protective support for the driven shaft bearing retaining spring 4 to prevent the driven shaft bearing retaining spring 4 and the power output driven shaft 7, the driven shaft bearing 9, the power output driven gear 1, the power output driven gear bushing 8, the driven gear retaining ring 5 and other parts from undergoing large axial movement due to external force impact, thereby causing faults such as component breakage, damage, tooth breaking, and early wear of the housing inner hole.

[0030] Specifically, an annular groove for installing the driven shaft bearing retaining spring 4 is provided on the inner wall of the power output housing 6 , and the position of the driven shaft bearing retaining spring 4 is fixed after installation.

[0031] Specifically, bolt holes are provided on the protective flange 3 , and corresponding bolt holes are provided on the power output housing 6 , and the two are assembled together by connecting bolts 2 .

[0032] The protective flange 3 is annular, and a neck is axially extended at the inner ring thereof. After assembly, there is an axial separation gap of 0.15-0.25 mm between the neck and the driven shaft bearing retaining spring 4. The separation gap ensures that when the tractor PTO power output is working normally, the protective flange 3 and the driven shaft bearing retaining spring 4 do not generate force between each other, and do not affect the normal operation of the PTO power output driven shaft system.

[0033] The connection and fixing position of the protective flange 3 on the power output housing 6 needs to be finely designed by the blank or by adding tool processing steps to ensure the installation size requirements.

[0034] During the actual transmission process, it is necessary to install transmission structures such as gears on the power output driven shaft 7, that is, a driven gear bushing 8 is fixed on the outer end of the power output driven shaft 7, and the driven gear bushing 8 is fixed with the power output driven gear 1. The power output driven shaft 7 is provided with a driven gear retaining ring 5 for limiting the axial movement of the driven shaft bearing 9. The driven gear retaining ring 5 is installed on the shaft to isolate the power output driven gear 1 and the driven shaft bearing 9, and to produce a certain limit on the driven shaft bearing 9.

[0035] The driven gear retaining ring 5 is located in the installation gap between the driven gear bushing 8 and the driven shaft bearing 9. The width of the installation gap and the axial width of the driven gear retaining ring 5 have a width difference of 0.1-0.5mm, that is, the driven gear retaining ring 5 has an axial movable space of 0.1-0.5mm between the driven gear bushing 8 and the driven shaft bearing 9, which reduces the external axial force on the driven shaft bearing 9 and transmits it to the power output driven gear 1. The driven gear retaining ring 5 matched with the driven shaft bearing retaining spring 4 is provided to assist in supporting and protecting the driven shaft bearing. At the same time, the driven gear retaining ring 5 will not excessively restrict the driven shaft bearing 9, thereby ensuring the effectiveness of the protection of the protective flange 3.

[0036] The parts not described in detail in this embodiment are prior art.

[0037] It should be noted that although the utility model is described through the above embodiments, the utility model can also have other multiple embodiments. Without departing from the spirit and scope of the utility model, it is obvious that those skilled in the art can make various corresponding changes and deformations to the utility model, but these changes and deformations should all fall within the scope of protection of the attached claims of the utility model and their equivalents.

Claims

1. A protective structure for a tractor power output driven shaft, characterized in that: comprising a power output housing (6); A driven shaft bearing (9) and a driven shaft bearing retaining spring (4) for limiting axial movement of the driven shaft bearing (9) are arranged in the power output housing (6); the power output driven shaft (7) is mounted on the inner side of the driven shaft bearing retaining spring (4) and the driven shaft bearing (9); A protective flange (3) is provided on the power output housing (6) for providing support for the driven shaft bearing retaining spring (4) when it is deformed.

2. A protective structure for a tractor power output driven shaft according to claim 1, characterized in that: The protective flange (3) is annular, and has a neck extending axially from the inner ring thereof.

3. A protective structure for a tractor power output driven shaft according to claim 2, characterized in that: After assembly, an isolation gap is provided between the neck and the driven shaft bearing retaining spring (4) in the axial direction.

4. A protective structure for a tractor power output driven shaft according to claim 3, characterized in that: The width of the isolation gap is 0.15-0.25 mm.

5. The protective structure for a tractor power output driven shaft according to claim 1, characterized in that: A driven gear bushing (8) is fixed to the outer end of the power output driven shaft (7), and a power output driven gear (1) is fixed to the driven gear bushing (8); A driven gear retaining ring (5) for limiting axial movement of a driven shaft bearing (9) is provided on the power output driven shaft (7), and the driven gear retaining ring (5) is located in an installation gap between a driven gear bushing (8) and the driven shaft bearing (9).

6. A protective structure for a tractor power output driven shaft according to claim 5, characterized in that: There is a width difference between the width of the installation gap and the axial width of the driven gear retaining ring (5).

7. A protective structure for a tractor power output driven shaft according to claim 6, characterized in that: The width difference is 0.1-0.5 mm.

8. The protective structure for a tractor power output driven shaft according to claim 1, characterized in that: The protective flange (3) is fixedly connected to the power output housing (6) via connecting bolts (2).

9. The protective structure for a tractor power output driven shaft according to claim 1, characterized in that: The inner wall of the power output housing (6) is provided with an annular groove for mounting a driven shaft bearing retaining ring (4).

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